Jenkins: Automatically increment job's next build number

buildNumberIncrement.gs

// This script role is to increment the next job's build number automatically if some parameter is set
//

import jenkins.model.Jenkins
import hudson.model.*

def build = Thread.currentThread().executable
def parameterList = build.getAction(ParametersAction.class).getAllParameters()

def size = parameterList.size()
def incrementBuildNumber = null;

for (i = 0; i < size; i++)
{
    if (parameterList[i].name == "IncrementBuildNumber")
    {
        incrementBuildNumber = parameterList[i].value
    }
}

if (incrementBuildNumber != null && incrementBuildNumber.trim() != "" && incrementBuildNumber.trim() == "Yes")
{
    def job_data = Jenkins.instance.getItemByFullName(build.project.getName())
    last_job_num = job_data.getLastBuild().getNumber()
    println 'Set next build number to: ' + (last_job_num + 3)
    job_data.updateNextBuildNumber(last_job_num + 3)
}